Process for preparing a supported catalyst system for olefin polymerization, the catalyst system and its use

A process comprising:

• preparing a catalyst system, wherein the preparing step comprises the steps of:
• A) impregnating a porous support component with a mixture comprising:
• (a) a precatalyst, wherein the precatalyst comprises a metallocene and an iron complex,
• (b) at least one cocatalyst, and
• (c) a first solvent to form an immobilized catalyst component, wherein the porous support component has a total pore volume from 0.1 to 10 cm3/g, and a residual moisture content less than 5 wt. %, based upon the total weight of the porous support component, wherein the total volume of the mixture is from 0.8 to 2.0 times the total pore volume of the porous support component;
• B) adding a second solvent to the immobilized catalyst component, wherein the second solvent is a C5-16 alkane;
• and
• C) removing the solvent by filtration or evaporation.